Portable containment

ABSTRACT

A portable containment for receiving spilled fluid having collapsible end and side walls which in combination with a floor form a containment area when held in an upright position by braces position along the walls. In use certain of the walls and braces are collapsed into folded or down positions to allow vehicle entry into the containment area. Skids are positioned beneath the braces associated with certain walls. Flotation members are secured along the upper edges of at least the certain walls. The flotation members are capable of elevating the certain walls in the event spillage occurs prior to the certain walls being repositioned into the upright position. Elevation of the certain walls causes the associated braces to slide over the skids to assure their upstanding position which maintaining the walls in their upright position.

BACKGROUND OF THE INVENTION

This instant invention is directed to a flexible, portable containmentfor collecting hazardous chemicals such as petrochemicals and the like.Environmental ground contamination is often the long term result ofpoint of source spills of such materials during the transfer from onecontainer to the other. A primary problem exists during the transfer ofmaterials when servicing, to include fueling equipment and particularlyvehicles.

Prior art structures for collecting petrochemical containments are allknown in the art and have been used for years for preventing groundcontamination with hazardous material. Examples of these known devicesare disclosed in U.S. Pat. Nos. 4,671,024; 5,090,588; 5,316,175; and5,762,233.

The 024 and the 588 patent devices allow vehicle entry and exit byproviding resilient wall structures which are compressed during rolloverand return or expand to their original upright position after rollover.These devices present storage and transport problems, reliabilityproblems and cost problems.

The 175 and 233 patents disclose devices which utilize brace memberswhich when positioned in one position retain the containment walls in anupright position and in a second position allow the walls to be foldedflat for vehicle entry into the containment area. Should a contaminantbe spilled into the containment area while this wall is in the flatfolded or down position the containment will flow over the down wall andonto the ground. The devices of these products are otherwise reliable,easy to store and transport and are not cost prohibitive.

In order to insure that this situation does not occur it is a primaryobject of the instant invention to provide a flexible, foldable andportable containment with fail safe wall construction for vehicletraffic onto and off of.

Another object of the invention is the provision of a containment inwhich at least selected of its walls carry flotation devices.

Another object of the invention is a containment which is highlyreliable and can withstand vehicle traffic onto and off of.

Another object of the invention is a portable containment which does notrequire assembly at the site.

Another object of the invention is a containment in which a plurality offlotation members are carried by selected wall members.

Another object of the invention is to provide a containment in which thewall bracing members will move from the folded position into the lockedupstanding position due to upward wall movement.

Another object of the invention is a containment in which provision ismade to prevent human error causing ground contamination.

SUMMARY OF THE INVENTION

The instant invention is directed to a portable containment forcontaining spilled material. The containment comprises a bottom composedof flexible material, a pair of foldable and upstandable side walls anda pair of foldable upstanding end walls. The side and end walls areinterconnected along opposed ends, forming the corners of thecontainment, and are connected along their respective lower edges withthe bottom, forming a containment area.

Preferably the flexible forming material comprised a modified vinyl orpolyurethane coated synthetic fabric, woven or knitted.

A plurality of stays are engaged with the side and end walls and act toassist in maintaining the side and end walls in an upstandingconfiguration.

A plurality of foldable braces are connected at one end adjacent toupper edges of the end and side walls. The braces may be positioned inan extended or upstanding position which maintains the side and endwalls in a raised position forming the containment area which containsthe spilled material. The braces also allow the walls to be positionedin a down position to allow vehicles to drive over the down wall andinto the containment area.

There are pocket members arranged along upper edges of at least the endwalls. Flotation devices are carried in each of the pocket members.

The arrangement creates a safety device which will elevate the end wallsfrom the down position to a position above the level of the materialbeing spilled into the containment area and maintain the walls elevatedpreventing contamination. The flotation members are primarily arrangedwith the end walls which are usually the ones lowered for vehiclecrossover.

A portable containment, for containing spilled material formed offlexible synthetic material and which includes a bottom, end and sidewalls and brace members. The brace members are connected with the wallmembers and in a locked upstanding position retain the walls in a raisedposition. The braces may be selectively arranged in a folded position inwhich the walls associated with these braces are in a down position.

Skids are arranged beneath the braces. The skids allow the braces toslide outwardly from the folded position to assume the upstandingposition as the wall is elevated from the down position into theupstanding position.

The skids provide ease of assembly. They also function to accommodate asafety feature for the prevention of spillage due to accidental fillingof the containment area while the selected walls are in the downposition.

In the event contaminant is accidentally deposited into the containmentarea, the contaminant, due to the flotation devices, will raise thewalls from the down position. As the walls rise, the legs of the bracesslide over the skids into their upright position, securing the walls inthe raised position.

The pocket members comprise a plurality of laterally spaced pocketmembers which are arranged along the upper edge and over the length ofthe end walls. First ends of the brace members are connect with the endwalls between the pocket members. The flotation device comprises a stripor a plurality of strips of polyurethane foam. The polyurethane foamstrips may have a cross section which is one of rectangular, square,triangular, circular or half circular.

The pockets are preferably secured on the inner side adjacent the upperedge of the end walls. They may be comprised of folded over upper edgesof the end walls or they may be formed separately and attached to theend walls.

The braces may include first, second and third rigid legs with certainones having an end pivotally attached with the floor. The attachment maybe inwardly or of the end and side walls. Each brace may include a legpivotally connected with an edge of the end and side walls, another legpivotally connected with the floor with a pivotal connection between thefirst and second legs. Alternatively, each brace may include a rigid legpivotally connected with the end and side walls at one end and with anend of a second rigid leg at an opposite end.

A portable containment for receiving and containing spilled fluid havingcollapsible end and side walls. Each wall, but preferably only the endwalls, may be positioned into a collapsed or down position. The bracemembers associated with the end and side walls are positioned in afolded position when the walls are in the down position. In the downposition, the containment is configured to allow vehicle roll over forentry into the containment area. Here the vehicle is serviced in theusual manner.

Flotation members are secured with the upper edges of at least certainselected ones of the walls, preferably the end. The flotation membersform a safety device which, with the selected wall is in the downposition and should fluid accidentally spilled into the containmentarea, act to elevate and maintain the upper edge of the selected wallabove the level of the spilled fluid. By so functioning, the flotationmembers act as a safety device or a fail safe device which act toeliminate human error.

The flotation members may be spaced by the brace members. They are alsopreferably secured along the inner side of the upper edge of the wallsto which they are attached.

It is further preferable that the flotation devices are carried inpockets which are formed adjacent the upper edges of the selected walls.

The flotation devices preferably are comprised of polyurethane bars ofselected cross sectional shape.

DESCRIPTION OF THE DRAWINGS

The construction designed to carry out the invention will hereinafter bedescribed, together with other features thereof.

The invention will be more readily understood from a reading of thefollowing specification and by reference to the accompanying drawingsforming a part thereof, wherein an example of the invention is shown andwherein:

FIG. 1A is a perspective view of the containment showing a first bracearrangement with an end and the side walls positioned in the uprightposition and the opposed end wall in the down position.

FIG. 1B is similar to FIG. 1a showing a second brace arrangement.

FIG. 2A is a sectional perspective view showing the first bracearrangement in the upstanding position maintaining the wall portion in araised position.

FIG. 2B is similar to FIG. 2a showing the brace arrangement in anintermediate position.

FIG. 3A is a section or side view showing the brace in an upstandingposition retaining the wall position in a raised position.

FIG. 3B is similar to FIG. 3A showing the brace member in anintermediate position.

FIG. 3C is similar of FIGS. 3A & B showing the brace member in thefolded position.

FIG. 4 is a sectional side view showing the second brace arrangement inits upstanding position holding the wall portion in a substantiallyupright position.

FIG. 5 is similar to FIG. 4 showing the brace in its intermediateposition in which the associated wall portion is being folded orlowered.

FIG. 6a is a cross sectional side view showing a first cross-sectionalshape of a flotation member in its carrying pocket secured to theassociated wall.

FIG. 6b is similar to FIG. 6a showing a second configuration for theflotation members.

FIG. 6c is similar to FIG. 6a showing a third configuration for theflotation member.

FIG. 6d is similar to FIG. 6a showing a third configuration for theflotation members.

DESCRIPTION OF A PREFERRED EMBODIMENT

Referring now in more detail to the drawings, it can be seen in FIG. 1Aflexible and portable containment device designated 10. Containmentdevice 10 is shown with end wall 12 in the down or lowered positionwhile in FIG. 1A end wall 12′ and side walls 14 shown in the generallyupright or raised position. Walls 12, 12′ and 14 are interconnected atopposing ends forming corners 16 and along their lower edges 18 withbottom 20 forming containment area 22. Heat welding is a preferredmethod of interconnecting these individual members. It is also notedthat walls 12, 12″ and 14 along with bottom 20 may be formed of acontinuous piece in which case corners 16 may be formed by simplyfolding that portion of the coated vinyl sheet forming the wall.

Braces 24 which are shown connected along the height of the walls andadjacent the upper edges 26 of walls 12, 12′ and 14 and with flange 40,function to secure walls 12, 12′ 14 in the generally raised position.

The material forming the containment is preferably some form of a vinylsheet or a vinyl coated fabric. Polyurethane is a suitable coatingmaterial. In matter of fact, any synthetic coated fabric generallysuitable for agricultural and/or industrial use, which is resistant topetrochemical degradation, is of sufficient grade to withstand the wearof entering and exiting vehicles and which is sufficiently flexible issuitable. Satisfactory fabrics are manufactured by the Seamon Corp. ofWooster, Ohio, Cooley, Inc. of Pawtucket, R.I. It is preferred thatcontainment 10 be formed in a rectangular configuration as shown,however, it is understood that other configurations such as square,circular, or rectangular are equally acceptable depending upon theintended use.

Again turning to FIG. 1A along with FIGS. 2A, B & 3A, B & C it can beseen that each corner 16 is provided with a unshaped bracing element 28secured by way of a strip 30 which is heat welded with the bottom, endand side walls. Bracing element 28 is more fully described in U.S. Pat.No. 5,316,175, the disclosure of which is incorporated herewith,functions to assist in holding the corners in a generally uprightposition when walls 12, 12′ and 14 are in that position. Bracingelements 28 are hinged at substantially their central point allowingthem to fold upon themselves when it is desired to fold the containmentfor transport to allow for vehicle roll over or vehicle entry and exitwhen the containment is deployed for use.

Flange or fringe 40 is preferably sized to extend outwardly up to alength at least equal the height of walls 12, 14. The flange ispreferably between six inches and twelve inches in width. Secured withfringe 40 at spaced intervals aligned with braces 24 are skids 42. Skidsare designed to support and provide a low friction surface for endportions of legs B, C of braces 24 during sliding movement of the bracefrom the folded position into the upright position as will be more fullydescribed further on. It is noted that the flange and skids may beprovided only adjacent walls 12, 12′.

Returning again to FIGS. 2 and 3, it can be seen that each brace 24includes a strip 30 secured with the wall in a vertical position,preferably by heat welding, forming pocket 32. A semi-rigid stay 34, iscarried in each pocket 32 of each strip 30. Stays 34 are of a lengthslightly less than the height of walls 12, 12′ and 14 and act to retainthem substantially along a single plane in the raised position.

Stay 34 along with strip 30 form the first leg A of brace 24.

Pivotally connected at 29 with the upper end of strip 30 is a secondstrip 30′ forming a second pocket 32′ which receives semi-rigid stay 34′forming the second leg B of brace 24. It is noted that leg B is slightlylonger than leg A.

Pivotally connected at 36 with the lower end of leg B is a third strip30″ forming pocket 32″ which houses a third semi-rigid stay 34″ formingthird leg C. Leg C is about a third the length of legs A & B.

Secured also at pivot 36 is an end of flexible strap 38 which strap islocated beneath leg C and is connected at its opposite end with bottom20. Flexible strap 38 is of a length substantially the same but slightlylonger than Leg C.

Flange 40, which extends outwardly of wall 12, 12′ and 14 has secured toits upper surface skids 42. Skids 40 are formed of a low frictionsynthetic material, preferably a poly amid which is preferably coatedwith a vinyl on its lower side only. The coating welds to the coatedsurface of the flange and the bottom of the containment securing theskids in fixed position on the flange. Each skid 42 is verticallyaligned with a brace 24 and is of a slightly greater width than strap 38and legs A, B & C.

Strap 38 is also formed of a synthetic material preferably the samematerial forming skid 42 with a low friction outer surface in the formof a woven or knitted fabric. The outer surfaces of strap 38 areuncoated.

Referring now to FIGS. 3A, B and C, brace 24 can be seen in its foldedposition in which the wall of containment 10 is lowered into its downposition with flotation member 52 lowered into a position adjacentbottom 20. Leg B is pivoted toward the wall and into a substantiallyhorizontal position while leg C is moved into a substantially horizontalposition between legs A, B. In this down position, the wall is inposition to accommodate entry or exit of vehicles.

In the event spillage occurs while the wall is in the down position,flotation member 52 will first engage with the spilled fluid and willelevate the wall as the fluid level rises. The wall will move first intoan intermediate position as shown in FIG. 3B. During this movement theends of legs B, C which are supported on strap 38 begin to slideoutwardly over skid 42. The outward force of the contained liquid issufficient to continue to urge legs B, C of brace 24 outward until theend of leg C clears leg A allowing leg C to drop into the horizontalposition shown in FIG. 3A. With legs A, B, C in these relative position,brace 24 is locked in its upstanding position. It is noted that strap 38limits the extend of outward movement of legs B, C.

Secured on the inner side and adjacent upper edge 26 of each of endwalls 12, 12′, is a pocket or a plurality of pockets 48. Each pocket isconstructed to include an elongate cavity adapted to receive or supporta flotation device 50. The pockets extend between corners 16substantially across end walls 12, 12″.

Turning now to FIGS. 1B, 4 and 5, a second arrangement of the bracingsystem is shown at 56. This brace arrangement, which operates onlywithin the containment area, is more fully described in U.S. Pat. No.5,316,175, the disclosure of which is incorporated herewith. As shown,end wall 12 connects with bottom 20 along seal 18. Strip 30 is securedwith the outer surface of wall 12 and extends across the height of thewall, forming pocket 32 between strip 30 and wall 12. A semi-rigid stayor leg 34, which functions to maintain the wall in the raised position,is carried in pocket 32 forming leg A′.

The brace 56 includes a strip 58 which forms pocket 60 between hingeareas 62, 63. A semi-rigid bracing element or stay 64 is carried bypocket 60 forming leg B′. Strip 58 extends beyond hinge 63 in the formof semi-rigid extension 66 forming leg C′. The end portion 66′ ofextension 66 is secured to bottom 20 by heat seal at 67. A hinge area 68is formed between end portion 66′ and extension 66.

In use brace 56 is arranged with the lower end of leg B′ engages withbottom 20 while extension 66 extends parallel and also in engagementwith the bottom. When it is desired that wall 12 be lowered hinges 62,63, 68 allow legs B′ and C′ to be configured as shown in FIG. 5 whichallows wall 12 to move inwardly into its folded or down position andsubstantially parallel with floor 20.

Pockets 48 are provided along the inner side of at least walls 12 and12′ adjacent upper edge 26 and in spaced positions across or along thelength of the end walls forming openings 52. These openings are adaptedto receive brace members 56 both in the upstanding and folded positions.Openings 52 insure unobstructed movement of the brace in transitionbetween positions.

Outer pockets 48 are preferably formed to begin adjacent each corner 16and to terminate just short of first brace 56 adjacent hinge 62. Asecond pocket begins on the opposite side of brace 56 forming an opening52 between adjacent pockets. Openings 52 are provided to receive andallow freedom of movement of leg B′ when the walls of containment 10 aremoved from the raised position to the down position or from the downposition to the raised position. Openings 52 also allow the containmentto be more evenly folded for storage.

Each pocket 48 supports or carries some type of flotation device 50.Preferably the flotation device comprise a plurality strips 59 ofsynthetic material such as foam polyethylene or other synthetic whichdoes not degrade when in contact with petrochemicals. The membersforming the flotation device could also comprise an air pocket or otherfloatable materials having suitable characteristics. Open cellpolyurethane is preferred.

The flotation strips along with the corresponding pockets 48 may be ofany of a plurality desired cross sections, four of which are shown inFIGS. 6a-b.

Preparatory to use, containment device 10 is transported to a desiredarea, unfolded and set up generally as shown in FIG. 1A or 1B with sidewalls 14 held in the generally raised positions and at least one of theend walls in the down position. Upon the arrival of a vehicle to beserviced, it is simply driven over the down end wall into containmentarea 22. The proper procedure is now to raise the down wall providingthe containment area 22 with all walls in the raised position. At thispoint the vehicle can be serviced as necessary without the danger ofaccidentally spilled fluids resulting in ground contamination.

It has been reported that in some instances, through oversight ornegligence, the down end wall has not been repositioned in itssubstantially upright position. This oversight, in some instances, hasresulted in ground contamination.

In order to insure that the containment containing device does not allowaccidental spillage the safety mechanism of this invention was devisedin the form of flotation devices attached to the upper edge of end walls12, 12′.

When an end wall is lowered into the entry/exit position shown in FIGS.1A, B at least the inner ones of pockets 48 are adjacent to or are inengagement with bottom 20. Should fluids be spilled into containmentarea 22 they will first engage the flotation strips which in turn willelevate the down wall bringing braces 24 or 56 into their upstandingposition.

While preferred embodiments of the invention have been described usingspecific terms, such description is for illustrative purposes only, andit is to be understood that changes and variations may be made withoutdeparting from the spirit or scope of the following claims.

1. A portable containment for containing spilled material: saidcontainment having a bottom, opposed end walls and opposed side wallsformed of flexible material and forming a containment area; a flotationmember carried by upper edges of at least said end walls; a plurality ofbraces connected with upper portions of at least one of said walls, saidbraces being positionable in locked upstanding positions in which saidat least one wall is held in a raised position and a lowered foldedposition in which said at least one wall is in a down entry/exitposition; a plurality of skids formed of low friction synthetic materialarranged along said bottom supporting said braces between said foldedposition and said upstanding position; wherein, in response to upwardmovement of said at least one wall, said braces are adapted to slidealong said skids from said folded position into said upstanding positionmaintaining said at least one wall in said raised position.
 2. Thecontainment of claim 1 wherein said flexible material forming saidcontainment comprises polyurethane coated fabric.
 3. The containment ofclaim 1 wherein said synthetic fabric forming said strap and said skidare coated on one side, said coated side being unexposed.
 4. Thecontainment of claim 1 wherein said end wall, side walls, bottom, bracesand skids forming said containment are united by welding.
 5. Thecontainment of claim 1 wherein said skid comprises a low frictionsynthetic fabric.
 6. The containment of claim 5 wherein; each said braceincludes a rigid first leg, a rigid second leg, a rigid third leg and aflexible strap, said first leg being carried by said wall in fixedposition, said second leg being hinged at a first end with an upperportion of the associated of said walls and at a second end with saidbottom, a first end of said strap and a first end of said third leg,said strap being connected at a second end with a lower portion of theassociated said walls.
 7. The containment of claim 6 wherein; each saidbrace forms a triangle in said upstanding position with said third legbeing positioned above said strap along said bottom between a lower endof said first leg and said second end of said second leg.
 8. Thecontainment of claim 5 wherein said strap comprises a synthetic fabric,said fabric forming said strap and said fabric forming said skidallowing said sliding action of said brace during movement into saidupstanding position.
 9. The portable containment of claim 5 wherein;said bottom extends outwardly beyond said end walls, said skids beingsecured with said bottom extensions.
 10. A portable containment forcontaining spilled material comprising; a bottom formed of flexiblematerial; a pair of foldable side walls formed of flexible material;and, a pair of foldable end walls formed of flexible material, said sidewalls being interconnected with said end walls along opposed endsforming corners and said side walls and said end walls being connectedalong respective lower edges with said bottom forming a containmentarea; a plurality of braces engaged with said side and end walls toassist in maintaining said side and end walls in a raised position; aplurality of pivotal braces connected at a first end adjacent upperedges of said end and side walls and at a second end with said bottom,said pivotal braces having an extended position maintaining said sideand end walls in said upstanding position for containing said spilledmaterial and a folded position in which said side and end walls may belowered into a down position for permitting vehicle drive over;flotation devices carried by pocket members arranged along upper edgesof at least said end walls, whereby, in the absence of said braces beingpositioned in said upstanding position said flotation devices willelevate and maintain at least said end walls from said down position toa position above the level of said spilled material preventingcontamination.
 11. The portable containment of claim 10 wherein; atleast said end wall comprises each said end wall.
 12. The portablecontainment of claim 10 wherein; said flotation devices comprise stripsof polyurethane foam.
 13. The portable containment of claim 12 wherein;said polyurethane foam strip has a cross section which is one ofrectangular, square, triangular, circular and half-circular.
 14. Theportable containment of claim 10 including pockets secured on the innerside of said end walls for supporting said flotation devices.
 15. Theportable containment of claim 14 wherein; said pockets comprise foldedover upper edges of said end walls.
 16. The portable containment ofclaim 10 wherein; said braces are permanently connected with said bottominwardly of said end and side walls.
 17. The portable containment ofclaim 10 wherein said flotation members are spaced by said bracemembers.
 18. A portable containment for containing fluid: saidcontainment having a bottom, opposed end walls and opposed side wallsformed of flexible material and forming a containment area; a flotationmember carried by upper edges of said walls; a plurality of bracesconnected with upper portions of at least said side walls, said bracesbeing positionable in locked upstanding positions in which at least saidside walls are held in a raised position and a lowered folded positionin which at least said side walls are in a down position; wherein,reception of fluid into said containment area causes said walls to moveupward, in response to said upward movement of said walls, said bracesare adapted to slide from said folded position into said lockedupstanding position maintaining at least said side walls in said raisedposition.
 19. The containment of claim 18 wherein said flexible materialforming said containment comprises coated fabric.
 20. A portablecontainment for containing spilled material comprising: a bottom formedof flexible material; a pair of foldable side walls formed of flexiblematerial; and, a pair of foldable end walls formed of flexible material,said side walls being interconnected with said end walls along opposedends forming corners and side walls and said end walls being connectedalong respective lower edges with said bottom forming a containmentarea; a plurality of pivotal braces connected at a first end adjacentupper edges of at least said side walls and at a second end with saidbottom, said pivotal braces having an extended position maintaining atleast said side walls in a generally upstanding position for containingsaid spilled material and a folded position in which at least said sidewalls may be lowered into a down position permitting folding fortransport; and flotation devices inserted into pocket members arrangedalong upper edges of at least said end walls; whereby, in the absence ofsaid braces said flotation devices will elevate and maintain at leastsaid end walls from said down position to said generally upstandingposition preventing spillage and contamination.
 21. The portablecontainment of claim 20 wherein; said flotation devices comprise stripsof synthetic foam.
 22. The portable containment of claim 21 wherein;said polyurethane foam strip has a cross section which is one ofrectangular, square, triangular, circular and half-circular.
 23. Theportable containment of claim 20 wherein said pocket members arearranged on the inner side of said end walls and are open ended forreceiving said flotation devices.
 24. The portable containment of claim20 wherein said side walls include said flotation devices secured alongupper edges thereof, and said braces engaged with said side walls arecarried from said folded position into said extended position duringelevation of said side walls from said down position into saidupstanding position.
 25. A portable containment easily spread over theground for containing spilled fluid comprising: flexible sheeting foroverlaying the ground forming a flooring; generally upstanding wallsinterconnected at opposed ends and connected along lower edges with saidflooring, said walls forming a containment area having opposed side andend walls; said sheeting forming a skirt outward of at least said sidewalls; flotation devices carried in upper edges of at least said endwalls, said flotation devices functioning to raise at least said endwalls into said generally upstanding position as fluid fills saidcontainment area; a plurality of braces connected with at least saidside walls and adjacent areas of said skirt, said braces having anextended position in which at least said side walls are held in saidgenerally upstanding position and a folded position in which at leastsaid side walls may be moved into a lowered position allowing saidcontainment to be folded for transport; each said brace comprising atleast three semi-rigid stays, the first of said stays being engaged withat least said side walls, the second of said stays being engaged withsaid skirt generally perpendicular of said first stays and the third ofsaid stays being positioned to engage with outer ends of said first andsecond stays when said braces are in said extended position, said bracesacting to maintain at least said side walls in said generally upstandingposition and to provide support against outward movement of at leastsaid side walls, said stays being positioned in generally juxtaposedparallel positions when said braces are in said folded position;wherein, said flotation devices act to allow at least sections of saidend walls to be depressed into said lowered position during vehicleoverpass and to raise said end wall sections into said generallyupstanding position after vehicle overpass.
 26. The containment of claim25 wherein; each said brace includes a rigid first leg, a rigid secondleg, and a rigid third leg, said first leg being carried by said wall,said second leg being hinged at a first end adjacent an upper portion ofsaid first leg and at a second end adjacent an end of said third leg,being engaged with said bottom.
 27. The containment of claim 26 wherein;each said brace forms a triangle in said upstanding position.
 28. Thecontainment of claim 25 wherein each of said upper edges of at leastsaid end walls includes an open ended pocket which is adapted to receivesaid flotation device.